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Iron Powder and Sulphur Powder Were Mixed Together and Divided into Two Parts a and B. When Part a Was Heated Strongly Over a Burner, Then - Science

Short Note

Iron powder and sulphur powder were mixed together and divided into two parts A and B. When part A was heated strongly over a burner, then a substance C was formed. The part B was, however, not heated at all. When dilute hydrochloric acid was added to substance C, then gas D was evolved and when dilute hydrochloric acid was added to part B then gas E was evolved.

  1. What type of substance is B ?
  2. What type of substance is C ?
  3. Name the gas (i) D, and (ii) E ?
  4. State one characteristic property of gas D.
  5. Write one test to identify gas E.
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  1. Here, iron powder and sulphur powder are mixed together. B is a mixture (Fe + S).
  2. Here, iron powder and sulphur powder are mixed together and heated strongly on a burner. So, C is the compound iron sulphide(FeS).
  3. i. Here, dilute HCl was added to C (iron sulphide)to obtain D, which is hydrogen sulphide gas.           
    FeS + 2HCl → FeCl2 + H2S
    ii. When dilute HCl is added to B, Fe present in the mixture reacts with the acid to form hydrogen gas.
    Fe + HCl → FeCl2 + H2
  4. Gas D smells like rotten egg.
  5. When a burning stick is held in the gas, the gas itself catches fire with blue flame and a ‘pop’ sound. In the process, the burning stick extinguishes.
Concept: Matter
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Lakhmir Singh Class 9 Chemistry - Science Part 2
Chapter 2 Is Matter Around Us Pure
Multiple Choice Questions | Q 72 | Page 59
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